AnsweredAssumed Answered

STM32F427 does not boot after power on

Question asked by anton.bogdan on Apr 26, 2018
Latest reply on Apr 28, 2018 by waclawek.jan


i  am using a design with a STM32F427  100pin package, and notice after leaving the board unpowered for several hours if i power up again, the software its not starting.

If i retry the restat the power it will stil not work, only after 3-4 retries. 

If i have the change to get starting  the software, then if i power off/on   it still works.



Boot1 - pin is left floating 

Boot0 pin - is tied to ground trough a 4K7 resistor

Reset pin - is tied to 3.3V trough 4k7 resistor.

Capacitors from pins 49,73  ( V_CAP) are 100nf X7R smd type


What is causing this strange behaviour?